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CVE-2026-27195

Wasmtime is a runtime for WebAssembly. Starting with Wasmtime 39.0.0, the `component-model-async` feature became the default, which brought with it a new implementation of `[Typed]Func::call_async` which made it capable of calling async-typed guest export functions. However, that implementation had a bug leading to a panic under certain circumstances: First, the host embedding calls `[Typed]Func::call_async` on a function exported by a component, polling the returned `Future` once. Second, the
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fb6bae53a3d97b94c9f7baa18696a9c1b8b19dabbe98fac727f07952bb9f0f5a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"wasmtime","vendor":"bytecodealliance","versions":[{"status":"affected","version":">= 39.0.0, < 40.0.4"},{"status":"affected","version":">= 41.0.0, < 41.0.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-755","description":"CWE-755: Improper Handling of Exceptional Conditions","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://bytecodealliance.zulipchat.com/#narrow/channel/206238-general/topic/.E2.9C.94.20Panic.20in.20Wasmtime.2041.2E0.2E3.20.28runtime.2Fconcurrent.2Fcomponent.29/with/574438798","tags":["x_refsource_MISC"],"url":"https://bytecodealliance.zulipchat.com/#narrow/channel/206238-general/topic/.E2.9C.94.20Panic.20in.20Wasmtime.2041.2E0.2E3.20.28runtime.2Fconcurrent.2Fcomponent.29/with/574438798"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/references/3
{"name":"https://github.com/bytecodealliance/wasmtime/commit/9e51c0d9a240a9613d279c061f82286bd11383fd","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/commit/9e51c0d9a240a9613d279c061f82286bd11383fd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/references/1
{"name":"https://github.com/bytecodealliance/wasmtime/commit/d86b00736b9ece60b3c81e52f7a7e4cdd9f7d895","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/commit/d86b00736b9ece60b3c81e52f7a7e4cdd9f7d895"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/references/2
{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v40.0.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/references/4
{"name":"https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/bytecodealliance/wasmtime/releases/tag/v41.0.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/references/5
{"name":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xjhv-v822-pf94","tags":["x_refsource_CONFIRM"],"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xjhv-v822-pf94"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d058299676fb344f76a0e498d73e03b7bc79ba3d0a9d6012c22217159eddd9ba · sha256:336f35b76c9d7cb7… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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